Centrality Dependence Of Particle Production In Math Mi P Mi Mo Mo Mi Pb Mi Math Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant
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Centrality Dependence Of Particle Production In Math Mi P Mi Mo Mo Mi Pb Mi Math Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant
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Author :
language : en
Publisher:
Release Date : 2015
Centrality Dependence Of Particle Production In Math Mi P Mi Mo Mo Mi Pb Mi Math Collisions At Math Mrow Msqrt Msub Mi Mi Mi Mathvariant written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Here, we report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at √sNN = 5.02TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (Npart) or the number of nucleon-nucleon binary collisions (Ncoll) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the Npart dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-pT the p-Pb spectra are found to be consistent with the pp spectra scaled by Ncoll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p-Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data.
Centrality Dependence Of Low Momentum Direct Photon Production In Math Mrow Mi Au Mi Mo Mo Mi Au Mi Mrow Math Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant
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Author :
language : en
Publisher:
Release Date : 2015
Centrality Dependence Of Low Momentum Direct Photon Production In Math Mrow Mi Au Mi Mo Mo Mi Au Mi Mrow Math Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi Mathvariant written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at √sNN = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e+e− pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT . In this paper, we find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range from 0.6-2.0 GeV/c. Finally, in this study, while the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N [alpha] part, where [alpha] = 1.38±0.03(stat)±0.07(syst).
Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo
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Author :
language : en
Publisher:
Release Date : 2016
Centrality Rapidity And Transverse Momentum Dependence Of Isolated Prompt Photon Production In Lead Lead Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
In this study, prompt photon production in √sNN = 2.76-TeV Pb+Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb-1. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals,
Centrality Dependence Of Identified Particle Elliptic Flow In Relativistic Heavy Ion Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo
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Author :
language : en
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Release Date : 2016
Centrality Dependence Of Identified Particle Elliptic Flow In Relativistic Heavy Ion Collisions At Math Mrow Msqrt Msub Mi Mi Mrow Mi N Mi Mi N Mi Mrow Msub Msqrt Mo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Here, elliptic flow (v2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at √sNN = 7.7-62.4 GeV are presented for three centrality classes. The centrality dependence and the data at √sNN = 14.5 GeV are new. Except at the lowest beam energies, we observe a similar relative v2 baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v2 for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with a multiphase transport (AMPT) model and fit with a blast wave model.
Onset Of Radial Flow In Math Mrow Mi P Mi Mo Mo Mi P Mi Mrow Math Collisions
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Author :
language : en
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Release Date : 2015
Onset Of Radial Flow In Math Mrow Mi P Mi Mo Mo Mi P Mi Mrow Math Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
It has been debated for decades whether hadrons emerging from p+p collisions exhibit collective expansion. The signal of the collective motion in p+p collisions is not as clear as in heavy-ion collisions because of the low multiplicity and large fluctuation in p+p collisions. Tsallis Blast-Wave (TBW) model is a thermodynamic approach, introduced to handle the overwhelming correlation and fluctuation in the hadronic processes. We have systematically studied the identified particle spectra in p+p collisions from RHIC to LHC using TBW and found no appreciable radial flow in p+p collisions below √s = 900 GeV. At LHC higher energy of 7 TeV in p+p collisions, the radial flow velocity achieves an average of ([beta]) = 0.320 ± 0.005. This flow velocity is comparable to that in peripheral (40-60%) Au+Au collisions at RHIC. In addition, breaking of the identified particle spectra mT scaling was also observed at LHC from a model independent test.
Measurement Of Math Mrow Mi Upsilon Mi Mo Mo Mn 1 Mn Mi Mi Mspace Width
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Math Mrow Mi Upsilon Mi Mo Mo Mn 1 Mn Mi Mi Mspace Width written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
We present measurements of bottomonium production in heavy-ion and p+p collisions at the Relativistic Heavy Ion Collider (RHIC). The inclusive yield of the three [Upsilon] states, [Upsilon](1S+2S+3S), was measured in the PHENIX experiment via electron-positron decay pairs at midrapidity for Au+Au and p+p collisions at sNN=200 GeV. The [Upsilon](1S+2S+3S)→e+e- differential cross section at midrapidity was found to be Beed[sigma]/dy=108±38(stat)±15(syst)±11(luminosity) pb in p+p collisions. The nuclear modification factor in the 30% most central Au+Au collisions indicates a suppression of the total [Upsilon] state yield relative to the extrapolation from p+p collision data. In conclusion, the suppression is consistent with measurements made by STAR at RHIC and at higher energies by the CMS experiment at the Large Hadron Collider.
Centrality Evolution Of The Charged Particle Pseudorapidity Density Over A Broad Pseudorapidity Range In Pb Pb Collisions At Mml
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Author :
language : en
Publisher:
Release Date : 2016
Centrality Evolution Of The Charged Particle Pseudorapidity Density Over A Broad Pseudorapidity Range In Pb Pb Collisions At Mml written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The centrality dependence of the charged-particle pseudorapidity density measured with ALICE in Pb-Pb collisions at √sNN = 2.76 TeV over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral collisions. No strong change of the overall shape of charged-particle pseudorapidity density distributions with centrality is observed, and when normalised to the number of participating nucleons in the collisions, the evolution over pseudorapidity with centrality is likewise small. Broadening the pseudorapidity range (-3.5
Forward Central Two Particle Correlations In P Pb Collisions At Mml
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Author :
language : en
Publisher:
Release Date : 2015
Forward Central Two Particle Correlations In P Pb Collisions At Mml written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5>
Multiplicity Dependence Of Jet Like Two Particle Correlation Structures In P Pb Collisions At Mml
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Author :
language : en
Publisher:
Release Date : 2014
Multiplicity Dependence Of Jet Like Two Particle Correlation Structures In P Pb Collisions At Mml written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum range 0.7
On The Concentration Properties Of Interacting Particle Processes
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Author : Pierre Del Moral
language : en
Publisher:
Release Date : 2012
On The Concentration Properties Of Interacting Particle Processes written by Pierre Del Moral and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Mathematical physics categories.